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Exam II - Exam Name MULTIPLE CHOICE Choose the one...

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Exam Name___________________________________ MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. 1) Introns are significant to biological evolution because 1) _______ A) they are translated into essential amino acids. B) their presence allows exons to be shuffled. C) they maintain the genetic code by preventing incorrect DNA base pairings. D) they protect the mRNA from degeneration. E) they correct enzymatic alterations of DNA bases. 2) Sequencing an entire genome, such as that of C. elegans , a nematode (worm), is most important because 2) _______ A) it allows researchers to use the sequence to build a "better" nematode, resistant to disease. B) a sequence that is found to have no introns in the nematode genome is likely to have acquired the introns from higher organisms. C) a sequence that is found to have a particular function in the nematode may have a closely related function in higher organisms D) the nematode is a good animal model for trying out cures for viral illness. E) it allows research on a group of organisms we do not usually care much about. 3) In both eukaryotes and prokaryotes, gene expression is primarily regulated at the level of 3) _______ 4) Which of the following properties or processes do we associate with living things? 4) _______ 5) What is the approximate atomic mass of an atom with 16 neutrons, 15 protons, and 15 electrons? 5) _______ 6) In a single molecule of water, two hydrogen atoms are bonded to a single oxygen atom by
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